Mumbai University > Electronics and telecommunication > Sem 7 > Applied Hydraulics

Marks: 08

Years: DEC 2015

The hydrauloc accumulator is a device used for storing the energy of a liquid in the form of pressure energy which may be supplied for any sudden or intermittent requirement. In case of hydraulic lift or the hydraulic crane, a large amount of energy is required when lift or crane is moving upward. This energy is supplied from hydraulic accumulator, But when the lift is moving in the downward direction, no large external energy is required and at that time the energy from the pump is stored in accumulator, fig shows a hydraulic accumulator which consists of a fixed vertical cylinder containing a sliding ram, a heavy weight is placed on the ram, which continuously supplies water under pressure to the cylinder. The outlet of the cylinder is connected to the machine (which may be lift or crane etc)

The ram is at the lowermost position in the beginning. The pump supplied water under pressure contiuously. If the water under pressure is not required by the machine (lift or crane) the water under pressure will be stored in the cylinder. This will raise the ram on which a heavy weight is placed. When the ram is at the uppermost position the cylinder is full of water and accumulator has stored the maximum amount of pressure energy when the machine(lift or crane) requires a large amount of energy, the hydraulic accumulator will supply this energy and ram will move in the downward direction.